Top half of agitator turns free (does not agitate)

Are you sure it’s agitating? If it isn’t agitating or spinning, then motor coupler is most likely broken. If it is actually agitating, but not spinning, clutch may be bad or article of clear thing could be lodged between basket and tub.

What is the model number of your unit?

sounds to me like the motor coupling is broken,this youtube video will show you how to replace it
http://youtu.be/9K1KHEogf3c

Your model may have a flexible (break able) drive component between the motor and the transmission. Check that, it is a pretty easy replacement.

My whirlpool heavy duty 2 speed 7 cycle washer machine stopped working, It fills up and aggitates for the first cycle then when it should drain and spin it doesnt drain nor spin

Hi Sherrie,
There is a service manual located inside the front left side of the cabinet.I find it easier to turn the washer on it's back and then reach up in the cabinet to get it.Hope this Helps !

You found a belt? Most w/p washer do not have a belt they are direct drive. take off the pump and motor to replace the motor coupling, 2 plastic pieces w/ a rubber in between

It sounds like the agitator gripping teeth are worn out. To check this, take the agitator cap off with a strong knife or flat-head screw driver, pull the cap off and check the plastice teeth and four plastic hooks that grab the teeth. If they are worn out, then you will have to replace the agitator. To replace it, you will see a nut that is between the circlular teeth. Unscrew the nut and pull the agitator up hard.

coupling.between motor and gearcase.

if its a 2 piece agitator.. the gears in top of agitator is stripped out.. change gears be like new....spin top countor clockwise if it dont grap.. gears bad